Subtract 7/20 from 21/49
21/49 - 7/20 is 11/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 20 is 980
Next, find the equivalent fraction of both fractional numbers with denominator 980 - For the 1st fraction, since 49 × 20 = 980,
21/49 = 21 × 20/49 × 20 = 420/980 - Likewise, for the 2nd fraction, since 20 × 49 = 980,
7/20 = 7 × 49/20 × 49 = 343/980 - Subtract the two like fractions:
420/980 - 343/980 = 420 - 343/980 = 77/980 - After reducing the fraction, the answer is 11/140
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